Finding the Fourth Proportional to 42,121,856.72, 63,182,785.80 and 10,209,152.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,121,856.72 : 63,182,785.80 = 10,209,152.72 : x
2. Step 2: Convert to fraction form
   42,121,856.72/63,182,785.80 = 10,209,152.72/x
3. Step 3: Cross multiply
   42,121,856.72x = 63,182,785.80 × 10,209,152.72
4. Step 4: Simplify right side
   42,121,856.72x = 645,042,709,507,247.38
5. Step 5: Solve for x
   x = 645,042,709,507,247.38/42,121,856.72
6. Step 6: Final answer
   x = 15,313,729.25