Finding the Fourth Proportional to 43,111.17, 64,666.80 and 13,531.32

Step by Step Solution

1. Step 1: Write the proportion equation
   43,111.17 : 64,666.80 = 13,531.32 : x
2. Step 2: Convert to fraction form
   43,111.17/64,666.80 = 13,531.32/x
3. Step 3: Cross multiply
   43,111.17x = 64,666.80 × 13,531.32
4. Step 4: Simplify right side
   43,111.17x = 875,027,164.18
5. Step 5: Solve for x
   x = 875,027,164.18/43,111.17
6. Step 6: Final answer
   x = 20,296.99