Finding the Fourth Proportional to 385,019.27, 577,568.52 and 145,335.05

Step by Step Solution

1. Step 1: Write the proportion equation
   385,019.27 : 577,568.52 = 145,335.05 : x
2. Step 2: Convert to fraction form
   385,019.27/577,568.52 = 145,335.05/x
3. Step 3: Cross multiply
   385,019.27x = 577,568.52 × 145,335.05
4. Step 4: Simplify right side
   385,019.27x = 83,940,949,005.95
5. Step 5: Solve for x
   x = 83,940,949,005.95/385,019.27
6. Step 6: Final answer
   x = 218,017.53