Finding the Fourth Proportional to 2,665,602.20, 3,998,403.30 and 772,405.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665,602.20 : 3,998,403.30 = 772,405.40 : x
2. Step 2: Convert to fraction form
   2,665,602.20/3,998,403.30 = 772,405.40/x
3. Step 3: Cross multiply
   2,665,602.20x = 3,998,403.30 × 772,405.40
4. Step 4: Simplify right side
   2,665,602.20x = 3,088,388,300,297.82
5. Step 5: Solve for x
   x = 3,088,388,300,297.82/2,665,602.20
6. Step 6: Final answer
   x = 1,158,608.10