Finding the Fourth Proportional to 291,131.89, 436,698.02 and 80,770.03

Step by Step Solution

1. Step 1: Write the proportion equation
   291,131.89 : 436,698.02 = 80,770.03 : x
2. Step 2: Convert to fraction form
   291,131.89/436,698.02 = 80,770.03/x
3. Step 3: Cross multiply
   291,131.89x = 436,698.02 × 80,770.03
4. Step 4: Simplify right side
   291,131.89x = 35,272,111,772.49
5. Step 5: Solve for x
   x = 35,272,111,772.49/291,131.89
6. Step 6: Final answer
   x = 121,155.09