Finding the Fourth Proportional to 2,128,401.60, 2,987,227.20 and 2,128,401.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128,401.60 : 2,987,227.20 = 2,128,401.60 : x
2. Step 2: Convert to fraction form
   2,128,401.60/2,987,227.20 = 2,128,401.60/x
3. Step 3: Cross multiply
   2,128,401.60x = 2,987,227.20 × 2,128,401.60
4. Step 4: Simplify right side
   2,128,401.60x = 6,358,019,152,043.52
5. Step 5: Solve for x
   x = 6,358,019,152,043.52/2,128,401.60
6. Step 6: Final answer
   x = 2,987,227.20