Finding the Fourth Proportional to 78,577.17, 108,438.78 and 42,769.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,577.17 : 108,438.78 = 42,769.50 : x
2. Step 2: Convert to fraction form
   78,577.17/108,438.78 = 42,769.50/x
3. Step 3: Cross multiply
   78,577.17x = 108,438.78 × 42,769.50
4. Step 4: Simplify right side
   78,577.17x = 4,637,872,401.21
5. Step 5: Solve for x
   x = 4,637,872,401.21/78,577.17
6. Step 6: Final answer
   x = 59,023.15