Finding the Fourth Proportional to 291,190.55, 436,786.12 and 91,528.38

Step by Step Solution

1. Step 1: Write the proportion equation
   291,190.55 : 436,786.12 = 91,528.38 : x
2. Step 2: Convert to fraction form
   291,190.55/436,786.12 = 91,528.38/x
3. Step 3: Cross multiply
   291,190.55x = 436,786.12 × 91,528.38
4. Step 4: Simplify right side
   291,190.55x = 39,978,326,084.50
5. Step 5: Solve for x
   x = 39,978,326,084.50/291,190.55
6. Step 6: Final answer
   x = 137,292.67