Finding the Fourth Proportional to 80,693.14, 121,056.12 and 28,106.72

Step by Step Solution

1. Step 1: Write the proportion equation
   80,693.14 : 121,056.12 = 28,106.72 : x
2. Step 2: Convert to fraction form
   80,693.14/121,056.12 = 28,106.72/x
3. Step 3: Cross multiply
   80,693.14x = 121,056.12 × 28,106.72
4. Step 4: Simplify right side
   80,693.14x = 3,402,490,469.13
5. Step 5: Solve for x
   x = 3,402,490,469.13/80,693.14
6. Step 6: Final answer
   x = 42,165.80