Finding the Fourth Proportional to 102,104.28, 153,139.14 and 28,215

Step by Step Solution

1. Step 1: Write the proportion equation
   102,104.28 : 153,139.14 = 28,215 : x
2. Step 2: Convert to fraction form
   102,104.28/153,139.14 = 28,215/x
3. Step 3: Cross multiply
   102,104.28x = 153,139.14 × 28,215
4. Step 4: Simplify right side
   102,104.28x = 4,320,820,835.10
5. Step 5: Solve for x
   x = 4,320,820,835.10/102,104.28
6. Step 6: Final answer
   x = 42,317.72