Finding the Fourth Proportional to 52,900.21, 72,990.88 and 30,531.25

Step by Step Solution

1. Step 1: Write the proportion equation
   52,900.21 : 72,990.88 = 30,531.25 : x
2. Step 2: Convert to fraction form
   52,900.21/72,990.88 = 30,531.25/x
3. Step 3: Cross multiply
   52,900.21x = 72,990.88 × 30,531.25
4. Step 4: Simplify right side
   52,900.21x = 2,228,502,805
5. Step 5: Solve for x
   x = 2,228,502,805/52,900.21
6. Step 6: Final answer
   x = 42,126.54