Finding the Fourth Proportional to 15,870.67, 21,901.53 and 8,796.94

Step by Step Solution

1. Step 1: Write the proportion equation
   15,870.67 : 21,901.53 = 8,796.94 : x
2. Step 2: Convert to fraction form
   15,870.67/21,901.53 = 8,796.94/x
3. Step 3: Cross multiply
   15,870.67x = 21,901.53 × 8,796.94
4. Step 4: Simplify right side
   15,870.67x = 192,666,445.32
5. Step 5: Solve for x
   x = 192,666,445.32/15,870.67
6. Step 6: Final answer
   x = 12,139.78