Finding the Fourth Proportional to 105,557.32, 145,661.52 and 57,802.96

Step by Step Solution

1. Step 1: Write the proportion equation
   105,557.32 : 145,661.52 = 57,802.96 : x
2. Step 2: Convert to fraction form
   105,557.32/145,661.52 = 57,802.96/x
3. Step 3: Cross multiply
   105,557.32x = 145,661.52 × 57,802.96
4. Step 4: Simplify right side
   105,557.32x = 8,419,667,014.10
5. Step 5: Solve for x
   x = 8,419,667,014.10/105,557.32
6. Step 6: Final answer
   x = 79,763.93