Finding the Fourth Proportional to 15,510.61, 21,417.56 and 14,384.99

Step by Step Solution

1. Step 1: Write the proportion equation
   15,510.61 : 21,417.56 = 14,384.99 : x
2. Step 2: Convert to fraction form
   15,510.61/21,417.56 = 14,384.99/x
3. Step 3: Cross multiply
   15,510.61x = 21,417.56 × 14,384.99
4. Step 4: Simplify right side
   15,510.61x = 308,091,502.90
5. Step 5: Solve for x
   x = 308,091,502.90/15,510.61
6. Step 6: Final answer
   x = 19,863.27