Finding the Fourth Proportional to 90,072, 124,328.52 and 56,538

Step by Step Solution

1. Step 1: Write the proportion equation
   90,072 : 124,328.52 = 56,538 : x
2. Step 2: Convert to fraction form
   90,072/124,328.52 = 56,538/x
3. Step 3: Cross multiply
   90,072x = 124,328.52 × 56,538
4. Step 4: Simplify right side
   90,072x = 7,029,285,863.76
5. Step 5: Solve for x
   x = 7,029,285,863.76/90,072
6. Step 6: Final answer
   x = 78,040.74