Finding the Fourth Proportional to 1,407.34, 2,111.28 and 541.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.34 : 2,111.28 = 541.72 : x
2. Step 2: Convert to fraction form
   1,407.34/2,111.28 = 541.72/x
3. Step 3: Cross multiply
   1,407.34x = 2,111.28 × 541.72
4. Step 4: Simplify right side
   1,407.34x = 1,143,722.60
5. Step 5: Solve for x
   x = 1,143,722.60/1,407.34
6. Step 6: Final answer
   x = 812.68