Finding the Fourth Proportional to 1,139,792.72, 1,709,688.73 and 429,654.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139,792.72 : 1,709,688.73 = 429,654.68 : x
2. Step 2: Convert to fraction form
   1,139,792.72/1,709,688.73 = 429,654.68/x
3. Step 3: Cross multiply
   1,139,792.72x = 1,709,688.73 × 429,654.68
4. Step 4: Simplify right side
   1,139,792.72x = 734,575,762,386.34
5. Step 5: Solve for x
   x = 734,575,762,386.34/1,139,792.72
6. Step 6: Final answer
   x = 644,481.89