Finding the Fourth Proportional to 76,577.71, 105,677.30 and 42,585.45

Step by Step Solution

1. Step 1: Write the proportion equation
   76,577.71 : 105,677.30 = 42,585.45 : x
2. Step 2: Convert to fraction form
   76,577.71/105,677.30 = 42,585.45/x
3. Step 3: Cross multiply
   76,577.71x = 105,677.30 × 42,585.45
4. Step 4: Simplify right side
   76,577.71x = 4,500,315,724.26
5. Step 5: Solve for x
   x = 4,500,315,724.26/76,577.71
6. Step 6: Final answer
   x = 58,767.96