Finding the Third Proportional to 66,934.69 and 139,417.88

Step by Step Solution

1. Step 1: Write the proportion equation
   66,934.69 : 139,417.88 = 139,417.88 : x
2. Step 2: Convert to fraction form
   66,934.69/139,417.88 = 139,417.88/x
3. Step 3: Cross multiply
   66,934.69x = 139,417.88 × 139,417.88
4. Step 4: Simplify right side
   66,934.69x = 19,437,343,869.52
5. Step 5: Solve for x
   x = 19,437,343,869.52/66,934.69
6. Step 6: Final answer
   x = 290,392.69