Finding the Fourth Proportional to 99,890.50, 137,848.89 and 55,178.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,890.50 : 137,848.89 = 55,178.50 : x
2. Step 2: Convert to fraction form
   99,890.50/137,848.89 = 55,178.50/x
3. Step 3: Cross multiply
   99,890.50x = 137,848.89 × 55,178.50
4. Step 4: Simplify right side
   99,890.50x = 7,606,294,976.87
5. Step 5: Solve for x
   x = 7,606,294,976.87/99,890.50
6. Step 6: Final answer
   x = 76,146.33