Finding the Fourth Proportional to 209,321.10, 314,054.55 and 91,077.30

Step by Step Solution

1. Step 1: Write the proportion equation
   209,321.10 : 314,054.55 = 91,077.30 : x
2. Step 2: Convert to fraction form
   209,321.10/314,054.55 = 91,077.30/x
3. Step 3: Cross multiply
   209,321.10x = 314,054.55 × 91,077.30
4. Step 4: Simplify right side
   209,321.10x = 28,603,240,466.72
5. Step 5: Solve for x
   x = 28,603,240,466.72/209,321.10
6. Step 6: Final answer
   x = 136,647.67