Finding the Third Proportional to 191,667.50 and 420,240.50

Step by Step Solution

1. Step 1: Write the proportion equation
   191,667.50 : 420,240.50 = 420,240.50 : x
2. Step 2: Convert to fraction form
   191,667.50/420,240.50 = 420,240.50/x
3. Step 3: Cross multiply
   191,667.50x = 420,240.50 × 420,240.50
4. Step 4: Simplify right side
   191,667.50x = 176,602,077,840.25
5. Step 5: Solve for x
   x = 176,602,077,840.25/191,667.50
6. Step 6: Final answer
   x = 921,398.14