Finding the Fourth Proportional to 535,498.35, 804,559.73 and 402,638.10

Step by Step Solution

1. Step 1: Write the proportion equation
   535,498.35 : 804,559.73 = 402,638.10 : x
2. Step 2: Convert to fraction form
   535,498.35/804,559.73 = 402,638.10/x
3. Step 3: Cross multiply
   535,498.35x = 804,559.73 × 402,638.10
4. Step 4: Simplify right side
   535,498.35x = 323,946,401,023.71
5. Step 5: Solve for x
   x = 323,946,401,023.71/535,498.35
6. Step 6: Final answer
   x = 604,943.79