Finding the Fourth Proportional to 78,688.83, 108,590.55 and 42,878.81

Step by Step Solution

1. Step 1: Write the proportion equation
   78,688.83 : 108,590.55 = 42,878.81 : x
2. Step 2: Convert to fraction form
   78,688.83/108,590.55 = 42,878.81/x
3. Step 3: Cross multiply
   78,688.83x = 108,590.55 × 42,878.81
4. Step 4: Simplify right side
   78,688.83x = 4,656,233,018.29
5. Step 5: Solve for x
   x = 4,656,233,018.29/78,688.83
6. Step 6: Final answer
   x = 59,172.73