Finding the Fourth Proportional to 28,245.50, 42,316.61 and 13,225.06

Step by Step Solution

1. Step 1: Write the proportion equation
   28,245.50 : 42,316.61 = 13,225.06 : x
2. Step 2: Convert to fraction form
   28,245.50/42,316.61 = 13,225.06/x
3. Step 3: Cross multiply
   28,245.50x = 42,316.61 × 13,225.06
4. Step 4: Simplify right side
   28,245.50x = 559,639,534.33
5. Step 5: Solve for x
   x = 559,639,534.33/28,245.50
6. Step 6: Final answer
   x = 19,813.41