Finding the Fourth Proportional to 123,421.10, 170,317.68 and 73,120.10

Step by Step Solution

1. Step 1: Write the proportion equation
   123,421.10 : 170,317.68 = 73,120.10 : x
2. Step 2: Convert to fraction form
   123,421.10/170,317.68 = 73,120.10/x
3. Step 3: Cross multiply
   123,421.10x = 170,317.68 × 73,120.10
4. Step 4: Simplify right side
   123,421.10x = 12,453,644,941.78
5. Step 5: Solve for x
   x = 12,453,644,941.78/123,421.10
6. Step 6: Final answer
   x = 100,903.70