Finding the Fourth Proportional to 1,429.98, 1,973.95 and 1,210.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.98 : 1,973.95 = 1,210.07 : x
2. Step 2: Convert to fraction form
   1,429.98/1,973.95 = 1,210.07/x
3. Step 3: Cross multiply
   1,429.98x = 1,973.95 × 1,210.07
4. Step 4: Simplify right side
   1,429.98x = 2,388,617.68
5. Step 5: Solve for x
   x = 2,388,617.68/1,429.98
6. Step 6: Final answer
   x = 1,670.39