Finding the Fourth Proportional to 42,213, 63,330.16 and 12,630.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,213 : 63,330.16 = 12,630.72 : x
2. Step 2: Convert to fraction form
   42,213/63,330.16 = 12,630.72/x
3. Step 3: Cross multiply
   42,213x = 63,330.16 × 12,630.72
4. Step 4: Simplify right side
   42,213x = 799,905,518.52
5. Step 5: Solve for x
   x = 799,905,518.52/42,213
6. Step 6: Final answer
   x = 18,949.27