Finding the Fourth Proportional to 209,329.10, 314,066.56 and 91,085.30

Step by Step Solution

1. Step 1: Write the proportion equation
   209,329.10 : 314,066.56 = 91,085.30 : x
2. Step 2: Convert to fraction form
   209,329.10/314,066.56 = 91,085.30/x
3. Step 3: Cross multiply
   209,329.10x = 314,066.56 × 91,085.30
4. Step 4: Simplify right side
   209,329.10x = 28,606,846,837.57
5. Step 5: Solve for x
   x = 28,606,846,837.57/209,329.10
6. Step 6: Final answer
   x = 136,659.68