Finding the Fourth Proportional to 15,510.72, 21,393.33 and 9,840.58

Step by Step Solution

1. Step 1: Write the proportion equation
   15,510.72 : 21,393.33 = 9,840.58 : x
2. Step 2: Convert to fraction form
   15,510.72/21,393.33 = 9,840.58/x
3. Step 3: Cross multiply
   15,510.72x = 21,393.33 × 9,840.58
4. Step 4: Simplify right side
   15,510.72x = 210,522,775.33
5. Step 5: Solve for x
   x = 210,522,775.33/15,510.72
6. Step 6: Final answer
   x = 13,572.73