Finding the Fourth Proportional to 91,860.27, 137,795.55 and 28,689.12

Step by Step Solution

1. Step 1: Write the proportion equation
   91,860.27 : 137,795.55 = 28,689.12 : x
2. Step 2: Convert to fraction form
   91,860.27/137,795.55 = 28,689.12/x
3. Step 3: Cross multiply
   91,860.27x = 137,795.55 × 28,689.12
4. Step 4: Simplify right side
   91,860.27x = 3,953,233,069.42
5. Step 5: Solve for x
   x = 3,953,233,069.42/91,860.27
6. Step 6: Final answer
   x = 43,035.29