Finding the Fourth Proportional to 2,231,697.60, 3,079,706.40 and 1,213,128

Step by Step Solution

1. Step 1: Write the proportion equation
   2,231,697.60 : 3,079,706.40 = 1,213,128 : x
2. Step 2: Convert to fraction form
   2,231,697.60/3,079,706.40 = 1,213,128/x
3. Step 3: Cross multiply
   2,231,697.60x = 3,079,706.40 × 1,213,128
4. Step 4: Simplify right side
   2,231,697.60x = 3,736,078,065,619.20
5. Step 5: Solve for x
   x = 3,736,078,065,619.20/2,231,697.60
6. Step 6: Final answer
   x = 1,674,096.91