Finding the Fourth Proportional to 429,667.35, 643,889.98 and 316,457.29

Step by Step Solution

1. Step 1: Write the proportion equation
   429,667.35 : 643,889.98 = 316,457.29 : x
2. Step 2: Convert to fraction form
   429,667.35/643,889.98 = 316,457.29/x
3. Step 3: Cross multiply
   429,667.35x = 643,889.98 × 316,457.29
4. Step 4: Simplify right side
   429,667.35x = 203,763,678,128.95
5. Step 5: Solve for x
   x = 203,763,678,128.95/429,667.35
6. Step 6: Final answer
   x = 474,235.89