Finding the Fourth Proportional to 99,644.74, 148,806.60 and 87,572.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,644.74 : 148,806.60 = 87,572.50 : x
2. Step 2: Convert to fraction form
   99,644.74/148,806.60 = 87,572.50/x
3. Step 3: Cross multiply
   99,644.74x = 148,806.60 × 87,572.50
4. Step 4: Simplify right side
   99,644.74x = 13,031,365,978.50
5. Step 5: Solve for x
   x = 13,031,365,978.50/99,644.74
6. Step 6: Final answer
   x = 130,778.26