Finding the Fourth Proportional to 1,400.05, 1,931.50 and 840.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.05 : 1,931.50 = 840.53 : x
2. Step 2: Convert to fraction form
   1,400.05/1,931.50 = 840.53/x
3. Step 3: Cross multiply
   1,400.05x = 1,931.50 × 840.53
4. Step 4: Simplify right side
   1,400.05x = 1,623,483.70
5. Step 5: Solve for x
   x = 1,623,483.70/1,400.05
6. Step 6: Final answer
   x = 1,159.59