Finding the Fourth Proportional to 151,405.98, 209,026.86 and 100,487.76

Step by Step Solution

1. Step 1: Write the proportion equation
   151,405.98 : 209,026.86 = 100,487.76 : x
2. Step 2: Convert to fraction form
   151,405.98/209,026.86 = 100,487.76/x
3. Step 3: Cross multiply
   151,405.98x = 209,026.86 × 100,487.76
4. Step 4: Simplify right side
   151,405.98x = 21,004,640,941.23
5. Step 5: Solve for x
   x = 21,004,640,941.23/151,405.98
6. Step 6: Final answer
   x = 138,730.59