Finding the Fourth Proportional to 42,713.08, 64,081.32 and 20,545

Step by Step Solution

1. Step 1: Write the proportion equation
   42,713.08 : 64,081.32 = 20,545 : x
2. Step 2: Convert to fraction form
   42,713.08/64,081.32 = 20,545/x
3. Step 3: Cross multiply
   42,713.08x = 64,081.32 × 20,545
4. Step 4: Simplify right side
   42,713.08x = 1,316,550,719.40
5. Step 5: Solve for x
   x = 1,316,550,719.40/42,713.08
6. Step 6: Final answer
   x = 30,823.13