Finding the Fourth Proportional to 140,311.30, 210,321.15 and 77,034.10

Step by Step Solution

1. Step 1: Write the proportion equation
   140,311.30 : 210,321.15 = 77,034.10 : x
2. Step 2: Convert to fraction form
   140,311.30/210,321.15 = 77,034.10/x
3. Step 3: Cross multiply
   140,311.30x = 210,321.15 × 77,034.10
4. Step 4: Simplify right side
   140,311.30x = 16,201,900,501.22
5. Step 5: Solve for x
   x = 16,201,900,501.22/140,311.30
6. Step 6: Final answer
   x = 115,471.10