Finding the Fourth Proportional to 21,373.12, 29,499.96 and 12,988

Step by Step Solution

1. Step 1: Write the proportion equation
   21,373.12 : 29,499.96 = 12,988 : x
2. Step 2: Convert to fraction form
   21,373.12/29,499.96 = 12,988/x
3. Step 3: Cross multiply
   21,373.12x = 29,499.96 × 12,988
4. Step 4: Simplify right side
   21,373.12x = 383,145,480.48
5. Step 5: Solve for x
   x = 383,145,480.48/21,373.12
6. Step 6: Final answer
   x = 17,926.51