Finding the Fourth Proportional to 78,690.42, 108,592.92 and 42,880.59

Step by Step Solution

1. Step 1: Write the proportion equation
   78,690.42 : 108,592.92 = 42,880.59 : x
2. Step 2: Convert to fraction form
   78,690.42/108,592.92 = 42,880.59/x
3. Step 3: Cross multiply
   78,690.42x = 108,592.92 × 42,880.59
4. Step 4: Simplify right side
   78,690.42x = 4,656,528,479.42
5. Step 5: Solve for x
   x = 4,656,528,479.42/78,690.42
6. Step 6: Final answer
   x = 59,175.29