Finding the Fourth Proportional to 772,585.98, 1,066,139.06 and 428,436.02

Step by Step Solution

1. Step 1: Write the proportion equation
   772,585.98 : 1,066,139.06 = 428,436.02 : x
2. Step 2: Convert to fraction form
   772,585.98/1,066,139.06 = 428,436.02/x
3. Step 3: Cross multiply
   772,585.98x = 1,066,139.06 × 428,436.02
4. Step 4: Simplify right side
   772,585.98x = 456,772,368,160.07
5. Step 5: Solve for x
   x = 456,772,368,160.07/772,585.98
6. Step 6: Final answer
   x = 591,225.29