Finding the Fourth Proportional to 52,852.28, 72,934.56 and 28,978.13

Step by Step Solution

1. Step 1: Write the proportion equation
   52,852.28 : 72,934.56 = 28,978.13 : x
2. Step 2: Convert to fraction form
   52,852.28/72,934.56 = 28,978.13/x
3. Step 3: Cross multiply
   52,852.28x = 72,934.56 × 28,978.13
4. Step 4: Simplify right side
   52,852.28x = 2,113,507,343.51
5. Step 5: Solve for x
   x = 2,113,507,343.51/52,852.28
6. Step 6: Final answer
   x = 39,988.96