Finding the Fourth Proportional to 2,139, 2,951.82 and 1,207.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139 : 2,951.82 = 1,207.50 : x
2. Step 2: Convert to fraction form
   2,139/2,951.82 = 1,207.50/x
3. Step 3: Cross multiply
   2,139x = 2,951.82 × 1,207.50
4. Step 4: Simplify right side
   2,139x = 3,564,322.65
5. Step 5: Solve for x
   x = 3,564,322.65/2,139
6. Step 6: Final answer
   x = 1,666.35