Finding the Fourth Proportional to 52,185.21, 72,015.73 and 28,311.88

Step by Step Solution

1. Step 1: Write the proportion equation
   52,185.21 : 72,015.73 = 28,311.88 : x
2. Step 2: Convert to fraction form
   52,185.21/72,015.73 = 28,311.88/x
3. Step 3: Cross multiply
   52,185.21x = 72,015.73 × 28,311.88
4. Step 4: Simplify right side
   52,185.21x = 2,038,900,564.31
5. Step 5: Solve for x
   x = 2,038,900,564.31/52,185.21
6. Step 6: Final answer
   x = 39,070.47