Finding the Fourth Proportional to 1,385.01, 2,072.61 and 864.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.01 : 2,072.61 = 864.59 : x
2. Step 2: Convert to fraction form
   1,385.01/2,072.61 = 864.59/x
3. Step 3: Cross multiply
   1,385.01x = 2,072.61 × 864.59
4. Step 4: Simplify right side
   1,385.01x = 1,791,947.52
5. Step 5: Solve for x
   x = 1,791,947.52/1,385.01
6. Step 6: Final answer
   x = 1,293.82