Finding the Fourth Proportional to 78,609.88, 108,478.72 and 42,799.17

Step by Step Solution

1. Step 1: Write the proportion equation
   78,609.88 : 108,478.72 = 42,799.17 : x
2. Step 2: Convert to fraction form
   78,609.88/108,478.72 = 42,799.17/x
3. Step 3: Cross multiply
   78,609.88x = 108,478.72 × 42,799.17
4. Step 4: Simplify right side
   78,609.88x = 4,642,798,908.39
5. Step 5: Solve for x
   x = 4,642,798,908.39/78,609.88
6. Step 6: Final answer
   x = 59,061.27