Finding the Fourth Proportional to 402,748.89, 555,802.61 and 221,470.89

Step by Step Solution

1. Step 1: Write the proportion equation
   402,748.89 : 555,802.61 = 221,470.89 : x
2. Step 2: Convert to fraction form
   402,748.89/555,802.61 = 221,470.89/x
3. Step 3: Cross multiply
   402,748.89x = 555,802.61 × 221,470.89
4. Step 4: Simplify right side
   402,748.89x = 123,094,097,593.67
5. Step 5: Solve for x
   x = 123,094,097,593.67/402,748.89
6. Step 6: Final answer
   x = 305,634.85