Finding the Fourth Proportional to 1,400.31, 1,932.32 and 840.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.31 : 1,932.32 = 840.80 : x
2. Step 2: Convert to fraction form
   1,400.31/1,932.32 = 840.80/x
3. Step 3: Cross multiply
   1,400.31x = 1,932.32 × 840.80
4. Step 4: Simplify right side
   1,400.31x = 1,624,701.59
5. Step 5: Solve for x
   x = 1,624,701.59/1,400.31
6. Step 6: Final answer
   x = 1,160.24