Finding the Fourth Proportional to 52,830.53, 72,905.70 and 28,957.15

Step by Step Solution

1. Step 1: Write the proportion equation
   52,830.53 : 72,905.70 = 28,957.15 : x
2. Step 2: Convert to fraction form
   52,830.53/72,905.70 = 28,957.15/x
3. Step 3: Cross multiply
   52,830.53x = 72,905.70 × 28,957.15
4. Step 4: Simplify right side
   52,830.53x = 2,111,141,290.76
5. Step 5: Solve for x
   x = 2,111,141,290.76/52,830.53
6. Step 6: Final answer
   x = 39,960.63