Finding the Fourth Proportional to 28,077.94, 42,105.84 and 10,538.20

Step by Step Solution

1. Step 1: Write the proportion equation
   28,077.94 : 42,105.84 = 10,538.20 : x
2. Step 2: Convert to fraction form
   28,077.94/42,105.84 = 10,538.20/x
3. Step 3: Cross multiply
   28,077.94x = 42,105.84 × 10,538.20
4. Step 4: Simplify right side
   28,077.94x = 443,719,763.09
5. Step 5: Solve for x
   x = 443,719,763.09/28,077.94
6. Step 6: Final answer
   x = 15,803.15