Finding the Fourth Proportional to 99,492.75, 137,300.13 and 54,780.75

Step by Step Solution

1. Step 1: Write the proportion equation
   99,492.75 : 137,300.13 = 54,780.75 : x
2. Step 2: Convert to fraction form
   99,492.75/137,300.13 = 54,780.75/x
3. Step 3: Cross multiply
   99,492.75x = 137,300.13 × 54,780.75
4. Step 4: Simplify right side
   99,492.75x = 7,521,404,096.50
5. Step 5: Solve for x
   x = 7,521,404,096.50/99,492.75
6. Step 6: Final answer
   x = 75,597.51