Finding the Fourth Proportional to 90,828.61, 136,264.82 and 28,499.11

Step by Step Solution

1. Step 1: Write the proportion equation
   90,828.61 : 136,264.82 = 28,499.11 : x
2. Step 2: Convert to fraction form
   90,828.61/136,264.82 = 28,499.11/x
3. Step 3: Cross multiply
   90,828.61x = 136,264.82 × 28,499.11
4. Step 4: Simplify right side
   90,828.61x = 3,883,425,611.15
5. Step 5: Solve for x
   x = 3,883,425,611.15/90,828.61
6. Step 6: Final answer
   x = 42,755.53