Finding the Fourth Proportional to 42,985,890.30, 64,487,345.31 and 12,280,731.06

Step by Step Solution

1. Step 1: Write the proportion equation
   42,985,890.30 : 64,487,345.31 = 12,280,731.06 : x
2. Step 2: Convert to fraction form
   42,985,890.30/64,487,345.31 = 12,280,731.06/x
3. Step 3: Cross multiply
   42,985,890.30x = 64,487,345.31 × 12,280,731.06
4. Step 4: Simplify right side
   42,985,890.30x = 791,951,744,525,462.38
5. Step 5: Solve for x
   x = 791,951,744,525,462.38/42,985,890.30
6. Step 6: Final answer
   x = 18,423,527.79