Finding the Fourth Proportional to 90,161.82, 135,188.73 and 42,788.70

Step by Step Solution

1. Step 1: Write the proportion equation
   90,161.82 : 135,188.73 = 42,788.70 : x
2. Step 2: Convert to fraction form
   90,161.82/135,188.73 = 42,788.70/x
3. Step 3: Cross multiply
   90,161.82x = 135,188.73 × 42,788.70
4. Step 4: Simplify right side
   90,161.82x = 5,784,550,011.35
5. Step 5: Solve for x
   x = 5,784,550,011.35/90,161.82
6. Step 6: Final answer
   x = 64,157.42