Finding the Fourth Proportional to 1,430.52, 1,973.82 and 840.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,430.52 : 1,973.82 = 840.72 : x
2. Step 2: Convert to fraction form
   1,430.52/1,973.82 = 840.72/x
3. Step 3: Cross multiply
   1,430.52x = 1,973.82 × 840.72
4. Step 4: Simplify right side
   1,430.52x = 1,659,429.95
5. Step 5: Solve for x
   x = 1,659,429.95/1,430.52
6. Step 6: Final answer
   x = 1,160.02