Finding the Fourth Proportional to 30,686.16, 42,364.98 and 28,914.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,686.16 : 42,364.98 = 28,914.72 : x
2. Step 2: Convert to fraction form
   30,686.16/42,364.98 = 28,914.72/x
3. Step 3: Cross multiply
   30,686.16x = 42,364.98 × 28,914.72
4. Step 4: Simplify right side
   30,686.16x = 1,224,971,534.51
5. Step 5: Solve for x
   x = 1,224,971,534.51/30,686.16
6. Step 6: Final answer
   x = 39,919.35