Finding the Fourth Proportional to 100,897,640.82, 139,238,742.87 and 54,487,890.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100,897,640.82 : 139,238,742.87 = 54,487,890.72 : x
2. Step 2: Convert to fraction form
   100,897,640.82/139,238,742.87 = 54,487,890.72/x
3. Step 3: Cross multiply
   100,897,640.82x = 139,238,742.87 × 54,487,890.72
4. Step 4: Simplify right side
   100,897,640.82x = 7,586,825,405,490,739
5. Step 5: Solve for x
   x = 7,586,825,405,490,739/100,897,640.82
6. Step 6: Final answer
   x = 75,193,288.40