Finding the Fourth Proportional to 689,291.57, 951,081.55 and 402,756.30

Step by Step Solution

1. Step 1: Write the proportion equation
   689,291.57 : 951,081.55 = 402,756.30 : x
2. Step 2: Convert to fraction form
   689,291.57/951,081.55 = 402,756.30/x
3. Step 3: Cross multiply
   689,291.57x = 951,081.55 × 402,756.30
4. Step 4: Simplify right side
   689,291.57x = 383,054,085,069.37
5. Step 5: Solve for x
   x = 383,054,085,069.37/689,291.57
6. Step 6: Final answer
   x = 555,721.41