Finding the Fourth Proportional to 28,411.32, 42,645.42 and 11,781.12

Step by Step Solution

1. Step 1: Write the proportion equation
   28,411.32 : 42,645.42 = 11,781.12 : x
2. Step 2: Convert to fraction form
   28,411.32/42,645.42 = 11,781.12/x
3. Step 3: Cross multiply
   28,411.32x = 42,645.42 × 11,781.12
4. Step 4: Simplify right side
   28,411.32x = 502,410,810.47
5. Step 5: Solve for x
   x = 502,410,810.47/28,411.32
6. Step 6: Final answer
   x = 17,683.47