Finding the Fourth Proportional to 15,870.11, 21,901.50 and 8,796.53

Step by Step Solution

1. Step 1: Write the proportion equation
   15,870.11 : 21,901.50 = 8,796.53 : x
2. Step 2: Convert to fraction form
   15,870.11/21,901.50 = 8,796.53/x
3. Step 3: Cross multiply
   15,870.11x = 21,901.50 × 8,796.53
4. Step 4: Simplify right side
   15,870.11x = 192,657,256.55
5. Step 5: Solve for x
   x = 192,657,256.55/15,870.11
6. Step 6: Final answer
   x = 12,139.63