Finding the Fourth Proportional to 385,364,483.68, 531,803,500.88 and 209,152,479.10

Step by Step Solution

1. Step 1: Write the proportion equation
   385,364,483.68 : 531,803,500.88 = 209,152,479.10 : x
2. Step 2: Convert to fraction form
   385,364,483.68/531,803,500.88 = 209,152,479.10/x
3. Step 3: Cross multiply
   385,364,483.68x = 531,803,500.88 × 209,152,479.10
4. Step 4: Simplify right side
   385,364,483.68x = 111,228,020,603,111,024
5. Step 5: Solve for x
   x = 111,228,020,603,111,024/385,364,483.68
6. Step 6: Final answer
   x = 288,630,699.80