Finding the Fourth Proportional to 1,406.10, 1,973.40 and 1,406.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.10 : 1,973.40 = 1,406.10 : x
2. Step 2: Convert to fraction form
   1,406.10/1,973.40 = 1,406.10/x
3. Step 3: Cross multiply
   1,406.10x = 1,973.40 × 1,406.10
4. Step 4: Simplify right side
   1,406.10x = 2,774,797.74
5. Step 5: Solve for x
   x = 2,774,797.74/1,406.10
6. Step 6: Final answer
   x = 1,973.40