Finding the Fourth Proportional to 2,620.86, 3,932.37 and 1,931.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.86 : 3,932.37 = 1,931.01 : x
2. Step 2: Convert to fraction form
   2,620.86/3,932.37 = 1,931.01/x
3. Step 3: Cross multiply
   2,620.86x = 3,932.37 × 1,931.01
4. Step 4: Simplify right side
   2,620.86x = 7,593,445.79
5. Step 5: Solve for x
   x = 7,593,445.79/2,620.86
6. Step 6: Final answer
   x = 2,897.31