Finding the Fourth Proportional to 1,430.52, 1,974.15 and 870.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,430.52 : 1,974.15 = 870.81 : x
2. Step 2: Convert to fraction form
   1,430.52/1,974.15 = 870.81/x
3. Step 3: Cross multiply
   1,430.52x = 1,974.15 × 870.81
4. Step 4: Simplify right side
   1,430.52x = 1,719,109.56
5. Step 5: Solve for x
   x = 1,719,109.56/1,430.52
6. Step 6: Final answer
   x = 1,201.74