Finding the Fourth Proportional to 78,688.16, 108,590.88 and 42,878.16

Step by Step Solution

1. Step 1: Write the proportion equation
   78,688.16 : 108,590.88 = 42,878.16 : x
2. Step 2: Convert to fraction form
   78,688.16/108,590.88 = 42,878.16/x
3. Step 3: Cross multiply
   78,688.16x = 108,590.88 × 42,878.16
4. Step 4: Simplify right side
   78,688.16x = 4,656,177,127.18
5. Step 5: Solve for x
   x = 4,656,177,127.18/78,688.16
6. Step 6: Final answer
   x = 59,172.53