Finding the Fourth Proportional to 21,098.32, 29,118.56 and 12,145.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,098.32 : 29,118.56 = 12,145.60 : x
2. Step 2: Convert to fraction form
   21,098.32/29,118.56 = 12,145.60/x
3. Step 3: Cross multiply
   21,098.32x = 29,118.56 × 12,145.60
4. Step 4: Simplify right side
   21,098.32x = 353,662,382.34
5. Step 5: Solve for x
   x = 353,662,382.34/21,098.32
6. Step 6: Final answer
   x = 16,762.58