Finding the Fourth Proportional to 1,550,178, 2,325,276.72 and 428,256.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550,178 : 2,325,276.72 = 428,256.72 : x
2. Step 2: Convert to fraction form
   1,550,178/2,325,276.72 = 428,256.72/x
3. Step 3: Cross multiply
   1,550,178x = 2,325,276.72 × 428,256.72
4. Step 4: Simplify right side
   1,550,178x = 995,815,381,199.56
5. Step 5: Solve for x
   x = 995,815,381,199.56/1,550,178
6. Step 6: Final answer
   x = 642,387.77