Finding the Fourth Proportional to 99,905.94, 137,866.12 and 54,585.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,905.94 : 137,866.12 = 54,585.50 : x
2. Step 2: Convert to fraction form
   99,905.94/137,866.12 = 54,585.50/x
3. Step 3: Cross multiply
   99,905.94x = 137,866.12 × 54,585.50
4. Step 4: Simplify right side
   99,905.94x = 7,525,490,267.47
5. Step 5: Solve for x
   x = 7,525,490,267.47/99,905.94
6. Step 6: Final answer
   x = 75,325.75