Finding the Fourth Proportional to 91,316, 136,974.05 and 28,986.50

Step by Step Solution

1. Step 1: Write the proportion equation
   91,316 : 136,974.05 = 28,986.50 : x
2. Step 2: Convert to fraction form
   91,316/136,974.05 = 28,986.50/x
3. Step 3: Cross multiply
   91,316x = 136,974.05 × 28,986.50
4. Step 4: Simplify right side
   91,316x = 3,970,398,300.33
5. Step 5: Solve for x
   x = 3,970,398,300.33/91,316
6. Step 6: Final answer
   x = 43,479.77