Finding the Fourth Proportional to 371,665.95, 512,855.51 and 218,670.50

Step by Step Solution

1. Step 1: Write the proportion equation
   371,665.95 : 512,855.51 = 218,670.50 : x
2. Step 2: Convert to fraction form
   371,665.95/512,855.51 = 218,670.50/x
3. Step 3: Cross multiply
   371,665.95x = 512,855.51 × 218,670.50
4. Step 4: Simplify right side
   371,665.95x = 112,146,367,141.83
5. Step 5: Solve for x
   x = 112,146,367,141.83/371,665.95
6. Step 6: Final answer
   x = 301,739.69