Finding the Fourth Proportional to 21,061.58, 29,052.18 and 12,558.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,061.58 : 29,052.18 = 12,558.02 : x
2. Step 2: Convert to fraction form
   21,061.58/29,052.18 = 12,558.02/x
3. Step 3: Cross multiply
   21,061.58x = 29,052.18 × 12,558.02
4. Step 4: Simplify right side
   21,061.58x = 364,837,712.22
5. Step 5: Solve for x
   x = 364,837,712.22/21,061.58
6. Step 6: Final answer
   x = 17,322.43