Finding the Fourth Proportional to 11,018.19, 15,160.05 and 9,521.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,018.19 : 15,160.05 = 9,521.31 : x
2. Step 2: Convert to fraction form
   11,018.19/15,160.05 = 9,521.31/x
3. Step 3: Cross multiply
   11,018.19x = 15,160.05 × 9,521.31
4. Step 4: Simplify right side
   11,018.19x = 144,343,535.67
5. Step 5: Solve for x
   x = 144,343,535.67/11,018.19
6. Step 6: Final answer
   x = 13,100.48