Finding the Fourth Proportional to 98,870.33, 136,449.45 and 55,857.72

Step by Step Solution

1. Step 1: Write the proportion equation
   98,870.33 : 136,449.45 = 55,857.72 : x
2. Step 2: Convert to fraction form
   98,870.33/136,449.45 = 55,857.72/x
3. Step 3: Cross multiply
   98,870.33x = 136,449.45 × 55,857.72
4. Step 4: Simplify right side
   98,870.33x = 7,621,755,172.25
5. Step 5: Solve for x
   x = 7,621,755,172.25/98,870.33
6. Step 6: Final answer
   x = 77,088.40