Finding the Fourth Proportional to 99,878.93, 137,831.98 and 54,556.89

Step by Step Solution

1. Step 1: Write the proportion equation
   99,878.93 : 137,831.98 = 54,556.89 : x
2. Step 2: Convert to fraction form
   99,878.93/137,831.98 = 54,556.89/x
3. Step 3: Cross multiply
   99,878.93x = 137,831.98 × 54,556.89
4. Step 4: Simplify right side
   99,878.93x = 7,519,684,171.34
5. Step 5: Solve for x
   x = 7,519,684,171.34/99,878.93
6. Step 6: Final answer
   x = 75,287.99