Finding the Fourth Proportional to 686,105.42, 947,287.53 and 428,374.76

Step by Step Solution

1. Step 1: Write the proportion equation
   686,105.42 : 947,287.53 = 428,374.76 : x
2. Step 2: Convert to fraction form
   686,105.42/947,287.53 = 428,374.76/x
3. Step 3: Cross multiply
   686,105.42x = 947,287.53 × 428,374.76
4. Step 4: Simplify right side
   686,105.42x = 405,794,068,314.74
5. Step 5: Solve for x
   x = 405,794,068,314.74/686,105.42
6. Step 6: Final answer
   x = 591,445.65