Finding the Fourth Proportional to 90,828.56, 136,264.73 and 28,499.06

Step by Step Solution

1. Step 1: Write the proportion equation
   90,828.56 : 136,264.73 = 28,499.06 : x
2. Step 2: Convert to fraction form
   90,828.56/136,264.73 = 28,499.06/x
3. Step 3: Cross multiply
   90,828.56x = 136,264.73 × 28,499.06
4. Step 4: Simplify right side
   90,828.56x = 3,883,416,914.32
5. Step 5: Solve for x
   x = 3,883,416,914.32/90,828.56
6. Step 6: Final answer
   x = 42,755.46