Finding the Fourth Proportional to 105,304.23, 145,314.78 and 57,557.61

Step by Step Solution

1. Step 1: Write the proportion equation
   105,304.23 : 145,314.78 = 57,557.61 : x
2. Step 2: Convert to fraction form
   105,304.23/145,314.78 = 57,557.61/x
3. Step 3: Cross multiply
   105,304.23x = 145,314.78 × 57,557.61
4. Step 4: Simplify right side
   105,304.23x = 8,363,971,434.48
5. Step 5: Solve for x
   x = 8,363,971,434.48/105,304.23
6. Step 6: Final answer
   x = 79,426.74