Finding the Fourth Proportional to 78,680.17, 108,577.26 and 42,870.48

Step by Step Solution

1. Step 1: Write the proportion equation
   78,680.17 : 108,577.26 = 42,870.48 : x
2. Step 2: Convert to fraction form
   78,680.17/108,577.26 = 42,870.48/x
3. Step 3: Cross multiply
   78,680.17x = 108,577.26 × 42,870.48
4. Step 4: Simplify right side
   78,680.17x = 4,654,759,253.28
5. Step 5: Solve for x
   x = 4,654,759,253.28/78,680.17
6. Step 6: Final answer
   x = 59,160.51