Finding the Fourth Proportional to 1,430.01, 2,141.57 and 812.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,430.01 : 2,141.57 = 812.21 : x
2. Step 2: Convert to fraction form
   1,430.01/2,141.57 = 812.21/x
3. Step 3: Cross multiply
   1,430.01x = 2,141.57 × 812.21
4. Step 4: Simplify right side
   1,430.01x = 1,739,395.89
5. Step 5: Solve for x
   x = 1,739,395.89/1,430.01
6. Step 6: Final answer
   x = 1,216.35