Finding the Fourth Proportional to 103,515, 142,959.12 and 71,333.28

Step by Step Solution

1. Step 1: Write the proportion equation
   103,515 : 142,959.12 = 71,333.28 : x
2. Step 2: Convert to fraction form
   103,515/142,959.12 = 71,333.28/x
3. Step 3: Cross multiply
   103,515x = 142,959.12 × 71,333.28
4. Step 4: Simplify right side
   103,515x = 10,197,742,935.51
5. Step 5: Solve for x
   x = 10,197,742,935.51/103,515
6. Step 6: Final answer
   x = 98,514.64