Finding the Fourth Proportional to 64,897.10, 90,634.50 and 64,897.10

Step by Step Solution

1. Step 1: Write the proportion equation
   64,897.10 : 90,634.50 = 64,897.10 : x
2. Step 2: Convert to fraction form
   64,897.10/90,634.50 = 64,897.10/x
3. Step 3: Cross multiply
   64,897.10x = 90,634.50 × 64,897.10
4. Step 4: Simplify right side
   64,897.10x = 5,881,916,209.95
5. Step 5: Solve for x
   x = 5,881,916,209.95/64,897.10
6. Step 6: Final answer
   x = 90,634.50