Finding the Fourth Proportional to 91,590.65, 137,405.69 and 28,409.50

Step by Step Solution

1. Step 1: Write the proportion equation
   91,590.65 : 137,405.69 = 28,409.50 : x
2. Step 2: Convert to fraction form
   91,590.65/137,405.69 = 28,409.50/x
3. Step 3: Cross multiply
   91,590.65x = 137,405.69 × 28,409.50
4. Step 4: Simplify right side
   91,590.65x = 3,903,626,677.56
5. Step 5: Solve for x
   x = 3,903,626,677.56/91,590.65
6. Step 6: Final answer
   x = 42,620.36