Finding the Fourth Proportional to 103,298.38, 142,556.43 and 80,903.50

Step by Step Solution

1. Step 1: Write the proportion equation
   103,298.38 : 142,556.43 = 80,903.50 : x
2. Step 2: Convert to fraction form
   103,298.38/142,556.43 = 80,903.50/x
3. Step 3: Cross multiply
   103,298.38x = 142,556.43 × 80,903.50
4. Step 4: Simplify right side
   103,298.38x = 11,533,314,134.51
5. Step 5: Solve for x
   x = 11,533,314,134.51/103,298.38
6. Step 6: Final answer
   x = 111,650.48