Finding the Fourth Proportional to 15,507.99, 21,401.01 and 8,434.46

Step by Step Solution

1. Step 1: Write the proportion equation
   15,507.99 : 21,401.01 = 8,434.46 : x
2. Step 2: Convert to fraction form
   15,507.99/21,401.01 = 8,434.46/x
3. Step 3: Cross multiply
   15,507.99x = 21,401.01 × 8,434.46
4. Step 4: Simplify right side
   15,507.99x = 180,506,016.31
5. Step 5: Solve for x
   x = 180,506,016.31/15,507.99
6. Step 6: Final answer
   x = 11,639.55