Finding the Fourth Proportional to 78,788.64, 108,727.05 and 42,977.87

Step by Step Solution

1. Step 1: Write the proportion equation
   78,788.64 : 108,727.05 = 42,977.87 : x
2. Step 2: Convert to fraction form
   78,788.64/108,727.05 = 42,977.87/x
3. Step 3: Cross multiply
   78,788.64x = 108,727.05 × 42,977.87
4. Step 4: Simplify right side
   78,788.64x = 4,672,857,020.38
5. Step 5: Solve for x
   x = 4,672,857,020.38/78,788.64
6. Step 6: Final answer
   x = 59,308.77