Finding the Fourth Proportional to 13,111.08, 18,091.26 and 7,521

Step by Step Solution

1. Step 1: Write the proportion equation
   13,111.08 : 18,091.26 = 7,521 : x
2. Step 2: Convert to fraction form
   13,111.08/18,091.26 = 7,521/x
3. Step 3: Cross multiply
   13,111.08x = 18,091.26 × 7,521
4. Step 4: Simplify right side
   13,111.08x = 136,064,366.46
5. Step 5: Solve for x
   x = 136,064,366.46/13,111.08
6. Step 6: Final answer
   x = 10,377.82