Finding the Fourth Proportional to 303,436.58, 455,009.50 and 143,379.32

Step by Step Solution

1. Step 1: Write the proportion equation
   303,436.58 : 455,009.50 = 143,379.32 : x
2. Step 2: Convert to fraction form
   303,436.58/455,009.50 = 143,379.32/x
3. Step 3: Cross multiply
   303,436.58x = 455,009.50 × 143,379.32
4. Step 4: Simplify right side
   303,436.58x = 65,238,950,607.72
5. Step 5: Solve for x
   x = 65,238,950,607.72/303,436.58
6. Step 6: Final answer
   x = 215,000.28