Finding the Fourth Proportional to 105,538.41, 145,643.67 and 57,792.15

Step by Step Solution

1. Step 1: Write the proportion equation
   105,538.41 : 145,643.67 = 57,792.15 : x
2. Step 2: Convert to fraction form
   105,538.41/145,643.67 = 57,792.15/x
3. Step 3: Cross multiply
   105,538.41x = 145,643.67 × 57,792.15
4. Step 4: Simplify right side
   105,538.41x = 8,417,060,823.19
5. Step 5: Solve for x
   x = 8,417,060,823.19/105,538.41
6. Step 6: Final answer
   x = 79,753.53