Finding the Fourth Proportional to 28,084.28, 42,105.63 and 13,275.91

Step by Step Solution

1. Step 1: Write the proportion equation
   28,084.28 : 42,105.63 = 13,275.91 : x
2. Step 2: Convert to fraction form
   28,084.28/42,105.63 = 13,275.91/x
3. Step 3: Cross multiply
   28,084.28x = 42,105.63 × 13,275.91
4. Step 4: Simplify right side
   28,084.28x = 558,990,343.85
5. Step 5: Solve for x
   x = 558,990,343.85/28,084.28
6. Step 6: Final answer
   x = 19,904.03