Finding the Fourth Proportional to 42,976,500.31, 64,471,748.87 and 12,687,425.11

Step by Step Solution

1. Step 1: Write the proportion equation
   42,976,500.31 : 64,471,748.87 = 12,687,425.11 : x
2. Step 2: Convert to fraction form
   42,976,500.31/64,471,748.87 = 12,687,425.11/x
3. Step 3: Cross multiply
   42,976,500.31x = 64,471,748.87 × 12,687,425.11
4. Step 4: Simplify right side
   42,976,500.31x = 817,980,485,498,852
5. Step 5: Solve for x
   x = 817,980,485,498,852/42,976,500.31
6. Step 6: Final answer
   x = 19,033,203.72