Finding the Fourth Proportional to 1,430.25, 1,973.50 and 840.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,430.25 : 1,973.50 = 840.89 : x
2. Step 2: Convert to fraction form
   1,430.25/1,973.50 = 840.89/x
3. Step 3: Cross multiply
   1,430.25x = 1,973.50 × 840.89
4. Step 4: Simplify right side
   1,430.25x = 1,659,502.40
5. Step 5: Solve for x
   x = 1,659,502.40/1,430.25
6. Step 6: Final answer
   x = 1,160.29