Finding the Fourth Proportional to 78,690.60, 108,593.06 and 42,880.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,690.60 : 108,593.06 = 42,880.50 : x
2. Step 2: Convert to fraction form
   78,690.60/108,593.06 = 42,880.50/x
3. Step 3: Cross multiply
   78,690.60x = 108,593.06 × 42,880.50
4. Step 4: Simplify right side
   78,690.60x = 4,656,524,494.93
5. Step 5: Solve for x
   x = 4,656,524,494.93/78,690.60
6. Step 6: Final answer
   x = 59,175.10