Finding the Fourth Proportional to 2,139.02, 2,951.93 and 1,207.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.02 : 2,951.93 = 1,207.50 : x
2. Step 2: Convert to fraction form
   2,139.02/2,951.93 = 1,207.50/x
3. Step 3: Cross multiply
   2,139.02x = 2,951.93 × 1,207.50
4. Step 4: Simplify right side
   2,139.02x = 3,564,455.48
5. Step 5: Solve for x
   x = 3,564,455.48/2,139.02
6. Step 6: Final answer
   x = 1,666.40