Finding the Fourth Proportional to 99,402, 137,174.76 and 54,690

Step by Step Solution

1. Step 1: Write the proportion equation
   99,402 : 137,174.76 = 54,690 : x
2. Step 2: Convert to fraction form
   99,402/137,174.76 = 54,690/x
3. Step 3: Cross multiply
   99,402x = 137,174.76 × 54,690
4. Step 4: Simplify right side
   99,402x = 7,502,087,624.40
5. Step 5: Solve for x
   x = 7,502,087,624.40/99,402
6. Step 6: Final answer
   x = 75,472.20