Finding the Fourth Proportional to 80,085.31, 120,346.16 and 42,672.08

Step by Step Solution

1. Step 1: Write the proportion equation
   80,085.31 : 120,346.16 = 42,672.08 : x
2. Step 2: Convert to fraction form
   80,085.31/120,346.16 = 42,672.08/x
3. Step 3: Cross multiply
   80,085.31x = 120,346.16 × 42,672.08
4. Step 4: Simplify right side
   80,085.31x = 5,135,421,054.72
5. Step 5: Solve for x
   x = 5,135,421,054.72/80,085.31
6. Step 6: Final answer
   x = 64,124.38