Finding the Fourth Proportional to 42,976,492.56, 64,471,737.24 and 12,687,417.36

Step by Step Solution

1. Step 1: Write the proportion equation
   42,976,492.56 : 64,471,737.24 = 12,687,417.36 : x
2. Step 2: Convert to fraction form
   42,976,492.56/64,471,737.24 = 12,687,417.36/x
3. Step 3: Cross multiply
   42,976,492.56x = 64,471,737.24 × 12,687,417.36
4. Step 4: Simplify right side
   42,976,492.56x = 817,979,838,288,134.50
5. Step 5: Solve for x
   x = 817,979,838,288,134.50/42,976,492.56
6. Step 6: Final answer
   x = 19,033,192.09