Finding the Fourth Proportional to 1,406.55, 2,111.12 and 713.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.55 : 2,111.12 = 713.70 : x
2. Step 2: Convert to fraction form
   1,406.55/2,111.12 = 713.70/x
3. Step 3: Cross multiply
   1,406.55x = 2,111.12 × 713.70
4. Step 4: Simplify right side
   1,406.55x = 1,506,706.34
5. Step 5: Solve for x
   x = 1,506,706.34/1,406.55
6. Step 6: Final answer
   x = 1,071.21