Finding the Fourth Proportional to 91,849.47, 137,779.34 and 28,678.31

Step by Step Solution

1. Step 1: Write the proportion equation
   91,849.47 : 137,779.34 = 28,678.31 : x
2. Step 2: Convert to fraction form
   91,849.47/137,779.34 = 28,678.31/x
3. Step 3: Cross multiply
   91,849.47x = 137,779.34 × 28,678.31
4. Step 4: Simplify right side
   91,849.47x = 3,951,278,825.17
5. Step 5: Solve for x
   x = 3,951,278,825.17/91,849.47
6. Step 6: Final answer
   x = 43,019.07