Finding the Fourth Proportional to 1,400.34, 1,931.72 and 840.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.34 : 1,931.72 = 840.54 : x
2. Step 2: Convert to fraction form
   1,400.34/1,931.72 = 840.54/x
3. Step 3: Cross multiply
   1,400.34x = 1,931.72 × 840.54
4. Step 4: Simplify right side
   1,400.34x = 1,623,687.93
5. Step 5: Solve for x
   x = 1,623,687.93/1,400.34
6. Step 6: Final answer
   x = 1,159.50