Finding the Fourth Proportional to 1,989.86, 2,985.27 and 1,406.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.86 : 2,985.27 = 1,406.00 : x
2. Step 2: Convert to fraction form
   1,989.86/2,985.27 = 1,406.00/x
3. Step 3: Cross multiply
   1,989.86x = 2,985.27 × 1,406.00
4. Step 4: Simplify right side
   1,989.86x = 4,197,274.69
5. Step 5: Solve for x
   x = 4,197,274.69/1,989.86
6. Step 6: Final answer
   x = 2,109.34