Finding the Fourth Proportional to 137,578.98, 189,774.72 and 91,011.27

Step by Step Solution

1. Step 1: Write the proportion equation
   137,578.98 : 189,774.72 = 91,011.27 : x
2. Step 2: Convert to fraction form
   137,578.98/189,774.72 = 91,011.27/x
3. Step 3: Cross multiply
   137,578.98x = 189,774.72 × 91,011.27
4. Step 4: Simplify right side
   137,578.98x = 17,271,638,281.09
5. Step 5: Solve for x
   x = 17,271,638,281.09/137,578.98
6. Step 6: Final answer
   x = 125,539.80