Finding the Fourth Proportional to 81,061.75, 121,586.55 and 28,471.69

Step by Step Solution

1. Step 1: Write the proportion equation
   81,061.75 : 121,586.55 = 28,471.69 : x
2. Step 2: Convert to fraction form
   81,061.75/121,586.55 = 28,471.69/x
3. Step 3: Cross multiply
   81,061.75x = 121,586.55 × 28,471.69
4. Step 4: Simplify right side
   81,061.75x = 3,461,774,559.77
5. Step 5: Solve for x
   x = 3,461,774,559.77/81,061.75
6. Step 6: Final answer
   x = 42,705.40