Finding the Fourth Proportional to 99,869.78, 137,819.52 and 54,547.76

Step by Step Solution

1. Step 1: Write the proportion equation
   99,869.78 : 137,819.52 = 54,547.76 : x
2. Step 2: Convert to fraction form
   99,869.78/137,819.52 = 54,547.76/x
3. Step 3: Cross multiply
   99,869.78x = 137,819.52 × 54,547.76
4. Step 4: Simplify right side
   99,869.78x = 7,517,746,100.28
5. Step 5: Solve for x
   x = 7,517,746,100.28/99,869.78
6. Step 6: Final answer
   x = 75,275.48