Finding the Fourth Proportional to 90,284.51, 135,346.23 and 42,870.35

Step by Step Solution

1. Step 1: Write the proportion equation
   90,284.51 : 135,346.23 = 42,870.35 : x
2. Step 2: Convert to fraction form
   90,284.51/135,346.23 = 42,870.35/x
3. Step 3: Cross multiply
   90,284.51x = 135,346.23 × 42,870.35
4. Step 4: Simplify right side
   90,284.51x = 5,802,339,574.55
5. Step 5: Solve for x
   x = 5,802,339,574.55/90,284.51
6. Step 6: Final answer
   x = 64,267.28