Finding the Fourth Proportional to 371,426.89, 511,421.42 and 290,083.72

Step by Step Solution

1. Step 1: Write the proportion equation
   371,426.89 : 511,421.42 = 290,083.72 : x
2. Step 2: Convert to fraction form
   371,426.89/511,421.42 = 290,083.72/x
3. Step 3: Cross multiply
   371,426.89x = 511,421.42 × 290,083.72
4. Step 4: Simplify right side
   371,426.89x = 148,355,027,447.94
5. Step 5: Solve for x
   x = 148,355,027,447.94/371,426.89
6. Step 6: Final answer
   x = 399,419.19