Finding the Fourth Proportional to 612,096.78, 918,300.70 and 359,590.76

Step by Step Solution

1. Step 1: Write the proportion equation
   612,096.78 : 918,300.70 = 359,590.76 : x
2. Step 2: Convert to fraction form
   612,096.78/918,300.70 = 359,590.76/x
3. Step 3: Cross multiply
   612,096.78x = 918,300.70 × 359,590.76
4. Step 4: Simplify right side
   612,096.78x = 330,212,443,900.45
5. Step 5: Solve for x
   x = 330,212,443,900.45/612,096.78
6. Step 6: Final answer
   x = 539,477.50