Finding the Fourth Proportional to 353,673.55, 488,106.72 and 309,662.91

Step by Step Solution

1. Step 1: Write the proportion equation
   353,673.55 : 488,106.72 = 309,662.91 : x
2. Step 2: Convert to fraction form
   353,673.55/488,106.72 = 309,662.91/x
3. Step 3: Cross multiply
   353,673.55x = 488,106.72 × 309,662.91
4. Step 4: Simplify right side
   353,673.55x = 151,148,547,305.76
5. Step 5: Solve for x
   x = 151,148,547,305.76/353,673.55
6. Step 6: Final answer
   x = 427,367.41