Finding the Fourth Proportional to 78,085.40, 107,756.55 and 42,275.12

Step by Step Solution

1. Step 1: Write the proportion equation
   78,085.40 : 107,756.55 = 42,275.12 : x
2. Step 2: Convert to fraction form
   78,085.40/107,756.55 = 42,275.12/x
3. Step 3: Cross multiply
   78,085.40x = 107,756.55 × 42,275.12
4. Step 4: Simplify right side
   78,085.40x = 4,555,421,082.04
5. Step 5: Solve for x
   x = 4,555,421,082.04/78,085.40
6. Step 6: Final answer
   x = 58,338.96