Finding the Fourth Proportional to 380,870.98, 571,381.20 and 140,986.98

Step by Step Solution

1. Step 1: Write the proportion equation
   380,870.98 : 571,381.20 = 140,986.98 : x
2. Step 2: Convert to fraction form
   380,870.98/571,381.20 = 140,986.98/x
3. Step 3: Cross multiply
   380,870.98x = 571,381.20 × 140,986.98
4. Step 4: Simplify right side
   380,870.98x = 80,557,309,816.78
5. Step 5: Solve for x
   x = 80,557,309,816.78/380,870.98
6. Step 6: Final answer
   x = 211,508.13