Finding the Fourth Proportional to 76,787.91, 105,975.92 and 42,799.50

Step by Step Solution

1. Step 1: Write the proportion equation
   76,787.91 : 105,975.92 = 42,799.50 : x
2. Step 2: Convert to fraction form
   76,787.91/105,975.92 = 42,799.50/x
3. Step 3: Cross multiply
   76,787.91x = 105,975.92 × 42,799.50
4. Step 4: Simplify right side
   76,787.91x = 4,535,716,495.04
5. Step 5: Solve for x
   x = 4,535,716,495.04/76,787.91
6. Step 6: Final answer
   x = 59,068.11