Finding the Fourth Proportional to 105,557.72, 145,669.88 and 57,160.18

Step by Step Solution

1. Step 1: Write the proportion equation
   105,557.72 : 145,669.88 = 57,160.18 : x
2. Step 2: Convert to fraction form
   105,557.72/145,669.88 = 57,160.18/x
3. Step 3: Cross multiply
   105,557.72x = 145,669.88 × 57,160.18
4. Step 4: Simplify right side
   105,557.72x = 8,326,516,561.38
5. Step 5: Solve for x
   x = 8,326,516,561.38/105,557.72
6. Step 6: Final answer
   x = 78,881.17