Finding the Fourth Proportional to 76,242.55, 105,222.05 and 42,258.40

Step by Step Solution

1. Step 1: Write the proportion equation
   76,242.55 : 105,222.05 = 42,258.40 : x
2. Step 2: Convert to fraction form
   76,242.55/105,222.05 = 42,258.40/x
3. Step 3: Cross multiply
   76,242.55x = 105,222.05 × 42,258.40
4. Step 4: Simplify right side
   76,242.55x = 4,446,515,477.72
5. Step 5: Solve for x
   x = 4,446,515,477.72/76,242.55
6. Step 6: Final answer
   x = 58,320.66