Finding the Fourth Proportional to 76,641.96, 105,763.80 and 42,648.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,641.96 : 105,763.80 = 42,648.72 : x
2. Step 2: Convert to fraction form
   76,641.96/105,763.80 = 42,648.72/x
3. Step 3: Cross multiply
   76,641.96x = 105,763.80 × 42,648.72
4. Step 4: Simplify right side
   76,641.96x = 4,510,690,692.34
5. Step 5: Solve for x
   x = 4,510,690,692.34/76,641.96
6. Step 6: Final answer
   x = 58,854.06