Finding the Fourth Proportional to 3,986,990.72, 5,983,127.44 and 2,191,128.32

Step by Step Solution

1. Step 1: Write the proportion equation
   3,986,990.72 : 5,983,127.44 = 2,191,128.32 : x
2. Step 2: Convert to fraction form
   3,986,990.72/5,983,127.44 = 2,191,128.32/x
3. Step 3: Cross multiply
   3,986,990.72x = 5,983,127.44 × 2,191,128.32
4. Step 4: Simplify right side
   3,986,990.72x = 13,109,799,975,953.10
5. Step 5: Solve for x
   x = 13,109,799,975,953.10/3,986,990.72
6. Step 6: Final answer
   x = 3,288,144.09