Finding the Fourth Proportional to 653,122, 901,733.40 and 398,620.72

Step by Step Solution

1. Step 1: Write the proportion equation
   653,122 : 901,733.40 = 398,620.72 : x
2. Step 2: Convert to fraction form
   653,122/901,733.40 = 398,620.72/x
3. Step 3: Cross multiply
   653,122x = 901,733.40 × 398,620.72
4. Step 4: Simplify right side
   653,122x = 359,449,617,156.05
5. Step 5: Solve for x
   x = 359,449,617,156.05/653,122
6. Step 6: Final answer
   x = 550,356.01