Finding the Fourth Proportional to 99,818.50, 137,749.74 and 54,496.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,818.50 : 137,749.74 = 54,496.50 : x
2. Step 2: Convert to fraction form
   99,818.50/137,749.74 = 54,496.50/x
3. Step 3: Cross multiply
   99,818.50x = 137,749.74 × 54,496.50
4. Step 4: Simplify right side
   99,818.50x = 7,506,878,705.91
5. Step 5: Solve for x
   x = 7,506,878,705.91/99,818.50
6. Step 6: Final answer
   x = 75,205.28