Finding the Fourth Proportional to 536,818.78, 805,238.56 and 429,705.60

Step by Step Solution

1. Step 1: Write the proportion equation
   536,818.78 : 805,238.56 = 429,705.60 : x
2. Step 2: Convert to fraction form
   536,818.78/805,238.56 = 429,705.60/x
3. Step 3: Cross multiply
   536,818.78x = 805,238.56 × 429,705.60
4. Step 4: Simplify right side
   536,818.78x = 346,015,516,085.42
5. Step 5: Solve for x
   x = 346,015,516,085.42/536,818.78
6. Step 6: Final answer
   x = 644,566.71