Finding the Fourth Proportional to 553,665.30, 775,656.30 and 553,665.30

Step by Step Solution

1. Step 1: Write the proportion equation
   553,665.30 : 775,656.30 = 553,665.30 : x
2. Step 2: Convert to fraction form
   553,665.30/775,656.30 = 553,665.30/x
3. Step 3: Cross multiply
   553,665.30x = 775,656.30 × 553,665.30
4. Step 4: Simplify right side
   553,665.30x = 429,453,978,036.39
5. Step 5: Solve for x
   x = 429,453,978,036.39/553,665.30
6. Step 6: Final answer
   x = 775,656.30