Finding the Fourth Proportional to 42,985,887.30, 64,487,340.81 and 12,280,728.06

Step by Step Solution

1. Step 1: Write the proportion equation
   42,985,887.30 : 64,487,340.81 = 12,280,728.06 : x
2. Step 2: Convert to fraction form
   42,985,887.30/64,487,340.81 = 12,280,728.06/x
3. Step 3: Cross multiply
   42,985,887.30x = 64,487,340.81 × 12,280,728.06
4. Step 4: Simplify right side
   42,985,887.30x = 791,951,495,800,150.25
5. Step 5: Solve for x
   x = 791,951,495,800,150.25/42,985,887.30
6. Step 6: Final answer
   x = 18,423,523.29