Finding the Fourth Proportional to 76,788.30, 105,976.43 and 42,799.89

Step by Step Solution

1. Step 1: Write the proportion equation
   76,788.30 : 105,976.43 = 42,799.89 : x
2. Step 2: Convert to fraction form
   76,788.30/105,976.43 = 42,799.89/x
3. Step 3: Cross multiply
   76,788.30x = 105,976.43 × 42,799.89
4. Step 4: Simplify right side
   76,788.30x = 4,535,779,332.59
5. Step 5: Solve for x
   x = 4,535,779,332.59/76,788.30
6. Step 6: Final answer
   x = 59,068.63