Finding the Fourth Proportional to 28,242.30, 42,335.90 and 13,447.25

Step by Step Solution

1. Step 1: Write the proportion equation
   28,242.30 : 42,335.90 = 13,447.25 : x
2. Step 2: Convert to fraction form
   28,242.30/42,335.90 = 13,447.25/x
3. Step 3: Cross multiply
   28,242.30x = 42,335.90 × 13,447.25
4. Step 4: Simplify right side
   28,242.30x = 569,301,152.36
5. Step 5: Solve for x
   x = 569,301,152.36/28,242.30
6. Step 6: Final answer
   x = 20,157.75