Finding the Fourth Proportional to 97,300.80, 145,513.80 and 81,554.40

Step by Step Solution

1. Step 1: Write the proportion equation
   97,300.80 : 145,513.80 = 81,554.40 : x
2. Step 2: Convert to fraction form
   97,300.80/145,513.80 = 81,554.40/x
3. Step 3: Cross multiply
   97,300.80x = 145,513.80 × 81,554.40
4. Step 4: Simplify right side
   97,300.80x = 11,867,290,650.72
5. Step 5: Solve for x
   x = 11,867,290,650.72/97,300.80
6. Step 6: Final answer
   x = 121,964.99