Finding the Third Proportional to 249,482.25 and 390,913.88

Step by Step Solution

1. Step 1: Write the proportion equation
   249,482.25 : 390,913.88 = 390,913.88 : x
2. Step 2: Convert to fraction form
   249,482.25/390,913.88 = 390,913.88/x
3. Step 3: Cross multiply
   249,482.25x = 390,913.88 × 390,913.88
4. Step 4: Simplify right side
   249,482.25x = 152,813,657,667.52
5. Step 5: Solve for x
   x = 152,813,657,667.52/249,482.25
6. Step 6: Final answer
   x = 612,523.17