Finding the Fourth Proportional to 76,439.48, 105,480.70 and 42,899

Step by Step Solution

1. Step 1: Write the proportion equation
   76,439.48 : 105,480.70 = 42,899 : x
2. Step 2: Convert to fraction form
   76,439.48/105,480.70 = 42,899/x
3. Step 3: Cross multiply
   76,439.48x = 105,480.70 × 42,899
4. Step 4: Simplify right side
   76,439.48x = 4,525,016,549.30
5. Step 5: Solve for x
   x = 4,525,016,549.30/76,439.48
6. Step 6: Final answer
   x = 59,197.37