Finding the Fourth Proportional to 102,821.31, 153,724.91 and 87,200.46

Step by Step Solution

1. Step 1: Write the proportion equation
   102,821.31 : 153,724.91 = 87,200.46 : x
2. Step 2: Convert to fraction form
   102,821.31/153,724.91 = 87,200.46/x
3. Step 3: Cross multiply
   102,821.31x = 153,724.91 × 87,200.46
4. Step 4: Simplify right side
   102,821.31x = 13,404,882,429.46
5. Step 5: Solve for x
   x = 13,404,882,429.46/102,821.31
6. Step 6: Final answer
   x = 130,370.66