Finding the Fourth Proportional to 76,785.30, 105,959.43 and 42,328.92

Step by Step Solution

1. Step 1: Write the proportion equation
   76,785.30 : 105,959.43 = 42,328.92 : x
2. Step 2: Convert to fraction form
   76,785.30/105,959.43 = 42,328.92/x
3. Step 3: Cross multiply
   76,785.30x = 105,959.43 × 42,328.92
4. Step 4: Simplify right side
   76,785.30x = 4,485,148,235.72
5. Step 5: Solve for x
   x = 4,485,148,235.72/76,785.30
6. Step 6: Final answer
   x = 58,411.55