Finding the Fourth Proportional to 99,878, 137,832.72 and 55,166

Step by Step Solution

1. Step 1: Write the proportion equation
   99,878 : 137,832.72 = 55,166 : x
2. Step 2: Convert to fraction form
   99,878/137,832.72 = 55,166/x
3. Step 3: Cross multiply
   99,878x = 137,832.72 × 55,166
4. Step 4: Simplify right side
   99,878x = 7,603,679,831.52
5. Step 5: Solve for x
   x = 7,603,679,831.52/99,878
6. Step 6: Final answer
   x = 76,129.68