Finding the Fourth Proportional to 1,400.16, 1,931.89 and 840.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.16 : 1,931.89 = 840.45 : x
2. Step 2: Convert to fraction form
   1,400.16/1,931.89 = 840.45/x
3. Step 3: Cross multiply
   1,400.16x = 1,931.89 × 840.45
4. Step 4: Simplify right side
   1,400.16x = 1,623,656.95
5. Step 5: Solve for x
   x = 1,623,656.95/1,400.16
6. Step 6: Final answer
   x = 1,159.62