Finding the Fourth Proportional to 391,087, 539,700.06 and 212,239

Step by Step Solution

1. Step 1: Write the proportion equation
   391,087 : 539,700.06 = 212,239 : x
2. Step 2: Convert to fraction form
   391,087/539,700.06 = 212,239/x
3. Step 3: Cross multiply
   391,087x = 539,700.06 × 212,239
4. Step 4: Simplify right side
   391,087x = 114,545,401,034.34
5. Step 5: Solve for x
   x = 114,545,401,034.34/391,087
6. Step 6: Final answer
   x = 292,889.82