Finding the Fourth Proportional to 139,154,071.50, 208,638,982.61 and 66,382,083.90

Step by Step Solution

1. Step 1: Write the proportion equation
   139,154,071.50 : 208,638,982.61 = 66,382,083.90 : x
2. Step 2: Convert to fraction form
   139,154,071.50/208,638,982.61 = 66,382,083.90/x
3. Step 3: Cross multiply
   139,154,071.50x = 208,638,982.61 × 66,382,083.90
4. Step 4: Simplify right side
   139,154,071.50x = 13,849,890,448,344,020
5. Step 5: Solve for x
   x = 13,849,890,448,344,020/139,154,071.50
6. Step 6: Final answer
   x = 99,529,178.69