Finding the Fourth Proportional to 43,071.08, 64,540.67 and 28,978.90

Step by Step Solution

1. Step 1: Write the proportion equation
   43,071.08 : 64,540.67 = 28,978.90 : x
2. Step 2: Convert to fraction form
   43,071.08/64,540.67 = 28,978.90/x
3. Step 3: Cross multiply
   43,071.08x = 64,540.67 × 28,978.90
4. Step 4: Simplify right side
   43,071.08x = 1,870,317,666.32
5. Step 5: Solve for x
   x = 1,870,317,666.32/43,071.08
6. Step 6: Final answer
   x = 43,423.98