Finding the Fourth Proportional to 105,662.23, 145,817.49 and 57,915.57

Step by Step Solution

1. Step 1: Write the proportion equation
   105,662.23 : 145,817.49 = 57,915.57 : x
2. Step 2: Convert to fraction form
   105,662.23/145,817.49 = 57,915.57/x
3. Step 3: Cross multiply
   105,662.23x = 145,817.49 × 57,915.57
4. Step 4: Simplify right side
   105,662.23x = 8,445,103,049.32
5. Step 5: Solve for x
   x = 8,445,103,049.32/105,662.23
6. Step 6: Final answer
   x = 79,925.47