Finding the Fourth Proportional to 660,667.05, 991,147.98 and 211,414.88

Step by Step Solution

1. Step 1: Write the proportion equation
   660,667.05 : 991,147.98 = 211,414.88 : x
2. Step 2: Convert to fraction form
   660,667.05/991,147.98 = 211,414.88/x
3. Step 3: Cross multiply
   660,667.05x = 991,147.98 × 211,414.88
4. Step 4: Simplify right side
   660,667.05x = 209,543,427,760.20
5. Step 5: Solve for x
   x = 209,543,427,760.20/660,667.05
6. Step 6: Final answer
   x = 317,169.48